Dynamic versus Static Hadronic Structure Functions Page: 1 of 6
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
Dynamic versus Static Hadronic Structure Functions*
Stanley J. Brodsky
SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94309, USA
"Static" structure functions are the probabilistic distributions computed from the square of the
light-front wavefunctions of the target hadron. In contrast, the "dynamic" structure functions
measured in deep inelastic lepton-hadron scattering include the effects of rescattering associ-
ated with the Wilson line. Initial- and final-state rescattering, neglected in the parton model,
can have a profound effect in QCD hard-scattering reactions, producing single-spin asymme-
tries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown
of the Lam-Tung relation in Drell-Yan reactions, nuclear shadowing, and non-universal nuclear
antishadowing novel leading-twist physics not incorporated in the light-front wavefunctions of
the target computed in isolation. I also review how "direct" higher-twist processes where a
proton is produced in the hard subprocess itself can explain the anomalous proton-to-pion
ratio seen in high centrality heavy ion collisions.
Key words: Diffraction, QCD, Light-Front Wavefunctions, Hadronization, Multiple Scattering,
PA CS: 24.85.+p, 12.38Aw, 12.40.Nn, 11.80.La, 25.75.Bh, 13.60.-r
It is important to distinguish "static" structure functions which are computed directly
from the light-front wavefunctions of a target hadron from the nonuniversal "dynamic"
empirical structure functions which take into account rescattering of the struck quark
in deep inelastic lepton scattering. [See fig. 1. ] The real wavefunctions underlying static
structure functions cannot describe diffractive deep inelastic scattering nor single-spin
asymmetries, since such phenomena involve the complex phase structure of the -*p am-
plitude. One can augment the light-front wavefunctions with a gauge link corresponding
* This research was supported by the Department of Energy contract DE-AC02-76SF00515. SLAC-
Email address: sjbth@slac .stanford.edu (Stanley J. Brodsky).
Preprint submitted to Elsevier 7 January 2009
Invited talk presented at the 18th International Conference On Particles And Nuclei (PANIC 08), 11/9/2008 to 11/14/2008, Eilat, Israel
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Brodsky, Stanley J. Dynamic versus Static Hadronic Structure Functions, article, January 9, 2009; United States. (https://digital.library.unt.edu/ark:/67531/metadc899754/m1/1/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.